Illuminating device



March 19, 1929. N, J GLASS 1,705,813

ILLUMINATING DEVI CE Filed sep1.\21, 192e r u r r r f d r n r r n n r r 5 r INVENTOR` 'to provide Panarea ia. ieee.

TES

i 1,705,813l PATENT OFFICE; a

NATHAN a. GLASS, or SAN FRANCISCO, carironNA.

' iLLUMiNATING DEVICE. e

Application filed.l September 21, 1926. Serial No. 136,799. f

This invention relates particularly to an.

improved torni of illuminating device to be used foi-the projection ol' a beam ot light..

' An object of theinventionis to provide an illuminatingdevice with a. single prisinmounted therein, and having a light generating means arranged relative to one side of the prism, to generate abeam .of light which may be reflected outwardly` in' a selected. direction. f i

A furtherv object ot' thezinvention is to provide an illuminating device to be used as a headlight for vehicles, and other uses, Jfrom which a beam of light ofprede teiininedy density and .volume is, ie'llected that does not possess nor is accompanied by the usual glare Tor blinding effect .created by.

light reflecting devices of al conventional character.

A` still further object of the .invention is along one Side thereof, Said casinghaving a triangular prism therein, to-relect aibeam of light l ply,'said prism'being rotatably mounted'in the casing, to 'adjust the angle otreflection of the light beam.

@ther objects of the invention `are. to provide a device of the character deseribedthat willr be superior in point of simplicity,inert-V pensivene'ss of construction, positiveness o operation, and -tacility and convenience in use and general etliciency;

ln thisy specification yand thefanneired drawings, the invention is illustrated 'in the toi-m considered to be the best, but it is toV be understood that thek invention is not limited to such form, because it may be em` bodied in other forms, and, it is also to be understood that in and by the claims following the description, it is desired to cover the invention in whatsoever torni it may be embodied.

ings,

the method kof .mounting the light bulbs in the casing.

ln detail ythe constructionillustrated in` the dra-Wings comprises a casing er housing l, preferably circular in cross section, hat@ kindred y a easingv havin-g an openingfrom a suitable source or" light sup'- ln the accompanying one sheet of drawllign 1 represents al cross section through Y, movable cover 3.' An elongated aperture 22 is provided lengthwise throughthe vperiphery et the casing 1', to provide an opening through which the beam of light, to be Lhere-k `inater described, may be reflected. A pair of` socket members l and 5 are rotatably mounted in each of the oppositeends of the 1 interior of the casingl A1, each socketmember having flanges Gstruck out from the inside j.' lace thereof, to torina-support lor one-ot `the oppositeends of the prism 7.*- yThe prisml 7 has an over all length'equal to that-of the space between the. socket `plates illi'and-` 5, whereby the Aends of the prism may be snugly positioned in the socket flanges 6,.to sup- 'e port the said ary position.

The 'socket plateV 4; is provided lWith. a stud S thereon that is rotatably journaled inthe lfixed end r`Wall 2, While theopposite socket plate ."5 is. provided -vvith ai shaft 9 `thereon that eXte'ndsthrough abearing il() in the removable cover. The end ot the shaft 9 is threaded to receive a binding nut 11 thereon, bymeans of Whieh'the shaft`9 maybe held in-a non-rotating position relative to the cover 3. The prism 7 anditssupporting socket members 4. and 5 form aunitary structure-'so that the prism .7 and socket plates may be .rotated Within thecasing 1 into f prism in a relatively stationany selected position ,and heldin that posi- `tion by tightening the binding nut -11v into engagement .With the cover of thec'a-sing. The `prism 17= is provided ywith apol'i'shed front vtace l2'and .a polished back ltacev J13 anda reflecting surface 14. The intersection face 15 of the front and rear faces 12 andlS isof a: ground inish and parallelsy the reflecting surface 14. Along the back tace 13 of the prism, I have arranged an open sided housing 16, Which said housing 16 is connected at its opposite ends to the opposite socket plates 4l and 5. rlhe housing 16 has a shea-th 17 slidably confined therein,v in which a pair of light bulbs 18 and 12) re spectively are mounted. The sheath 17 is f adapted to extend through an' opening in the lsocket plate 5 wherebyV saidsheath `may be removed Jfrom its Supportinghousing 16l in order to lixfor to adjust the light bulbs 18 and 19. 'The light bulbs 18 and 19 are connected 'byasuitable Wire20 to a source of lelectrical supply (not show-11)'.-Y

lvhe light generatedby the bulbsk 19 is projected from the bulbs and from the interior of the housing 16 through the polished back face 13 of the prism 7 and onto the reflecting surface 14 of ,said prism from Where the beam of light is reflected outwardly through the front face 12 of the prism. The aperture 22 in the casing 1 registers with the front face of the prism, and permits the beam of reflected light to be projected outwardly from the casing 1. By rotating the prism in the casing, it is possible to adjust the angularity of the beam of reflected light. I have found that the beam of `light reflected out from the prism 7 possesses none of .the troublesome glare that is cast by illuminating devices depending for their intensity upon highly polished reflectors and various types of planer lenses. With kmy illuminating device, it is possible for' a person to look directly into the beam of light Without being able to see the source from which *thebeam of light originates, and this eliminates the troublesome glare that 4is a source of annoyance in the majority of all conventional light diffusers.

Having thus described this invention, What I noW claim and desire to secure by Letters Patent is:

1. An illuminating device comprised of a prism having a reflecting surface and polished front and rear faces; anda light beam i generator arranged adjacent `the bacl face of the 4prism to cast a vbeam of light on the reflecting surface to be reflected out through the front face of the vprism .and means to adjust the angularity of the prism and generator. Y j

2. An illuminating `device comprised of a prism having a reflectingsurface and polished front and rear faces, the intersection of the front and rear faces fbeing ground to a non-reflecting surface parallel to ythe reo fleeting surface; anda light beam generator arranged adjacent the back face of the prism to cast a beam of light lon the reflecting surface to be reflected out-through the front face of the prism; and means to adjust the angularity of the prism and generator.

3. An illuminating device comprised of a prism having a reflecting surface and polished front and rear faces; a light beam generator arranged adjacent the back face of the prism to cast a beam of light on the reflecting surface to be reflected out through the front face of the prism; a casing enclosing the prism having an aperture therein registering with the front face of the prism; and means to rotate the prism inthe casing to adjust the angularity of the front face of the prism.

1. An illuminating device comprised of a prism having a reflecting surface and pol-VV 5. In combinationa casing having an ap-v erture therein; rotatable socket members arranged at opposite ends of the interior ofk the casing; a prism having its opposite ends confined in the rotatable socket members, said prism Vhaving -aoreflectingsurface and polished front and rear faces;l a light beam generator arranged adjacent the back face of the prism to cast a .beam of light on the reflecting surface to be reflected .out through the front face of the prism; and. means to hold the prism socket members in adjusted position Within` the easing.V Y

In testimonyV whereof, I have hereunto set my hand at San Francisco, California, this 27 day of August, 1926.

'NATHAN J.` eLAss. 

